Ok this thing just exploded water over my face and clothes. I'm fine, but it wasn't a small amount and I'm lucky I wear glasses. Luckily I did a cold run to test it so I was watching, but even so the exact same thing happened to me as eSporks first try.
It is not ok that the pressure relief from the bellows projecting water many feet away and up. ie: into your face. I couldn't design a more dangerous system if I tried. Yes the grind I used was fine, but not turkish fine, just the same setting that works in my Rancilo Silvia. I have used maybe 5X or even 10X as much pressure with my aeropress and paper filters with zero problems. The explosive release is all of a sudden and at height.
Lawsuit waiting to happen, if I can't fix it, I will have to use it very very gently and make sure noone else touches it...